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<p>Research on potentially toxic metal(loid)s (PTMs) in farmland soil is essential for safeguarding food security and protecting ecological health. Compared with research on central and eastern farmland, research on the PTMs of farmland soil in typical mountainous areas of western China is quite limited. ArcGIS spatial analysis, statistical analysis and the PMF model were used to study the spatial distribution and sources of PTMs in farmland soil. The results indicate that Cd, As, Hg, Cu, Zn, and Ni exceeded their corresponding background values in 100.00%, 55.77%, 21.15%, 9.62%, 7.69%, and 1.92% of the samples, respectively. Cd (114.25%), Hg (96.79%), and As (52.22%) were highly variable; Cu (20.62%), Zn (18.41%), and Pb (14.55%) were moderately variable. The 8 PTMs exhibited different spatial distributions and local spatial agglomeration patterns. Agricultural activities resulted in high contents of As, Zn, and Cu; Cd and Pb originated from mixed sources of transportation and agriculture; Hg was derived primarily from coal combustion sources; and Cr and Ni were chiefly from natural sources. Agricultural sources, mixed sources, coal combustion sources, and natural sources contributed 24.37%, 24.91%, 25.70%, and 25.02% of the total PTM concentrations, respectively. In our study, the mixed source was the priority anthropogenic source, and Cd were the priority element for pollution control in farmland soil in Jiange County.</p>

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Spatial heterogeneity and source apportionment of potentially toxic metal(loid)s in farmland soil in Jiange, Southwest China

  • 期刊论文

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  • 发表日期：

    2026年8月1日

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  • Xiaoci Huang,
  • Xiaoai Dai

摘要

Research on potentially toxic metal(loid)s (PTMs) in farmland soil is essential for safeguarding food security and protecting ecological health. Compared with research on central and eastern farmland, research on the PTMs of farmland soil in typical mountainous areas of western China is quite limited. ArcGIS spatial analysis, statistical analysis and the PMF model were used to study the spatial distribution and sources of PTMs in farmland soil. The results indicate that Cd, As, Hg, Cu, Zn, and Ni exceeded their corresponding background values in 100.00%, 55.77%, 21.15%, 9.62%, 7.69%, and 1.92% of the samples, respectively. Cd (114.25%), Hg (96.79%), and As (52.22%) were highly variable; Cu (20.62%), Zn (18.41%), and Pb (14.55%) were moderately variable. The 8 PTMs exhibited different spatial distributions and local spatial agglomeration patterns. Agricultural activities resulted in high contents of As, Zn, and Cu; Cd and Pb originated from mixed sources of transportation and agriculture; Hg was derived primarily from coal combustion sources; and Cr and Ni were chiefly from natural sources. Agricultural sources, mixed sources, coal combustion sources, and natural sources contributed 24.37%, 24.91%, 25.70%, and 25.02% of the total PTM concentrations, respectively. In our study, the mixed source was the priority anthropogenic source, and Cd were the priority element for pollution control in farmland soil in Jiange County.